What 210 × 297 mm means
A4 gives a full writing sheet for dense daily, project and notes pages. The finished rectangle does not define a punch pattern, printer margin, cover or binding fit.
The builder preserves these finished dimensions and will not silently scale the page to make an incompatible imposition fit.
Choose the paper you print on and the binding margin
Print directly on A4. A4 cannot be centered at 100% on US Letter because its 297 mm height exceeds Letter’s 279.4 mm height, and neither A4 nor Letter can hold two A4 pages side by side at 100%. Choose direct A4 rather than allowing a print dialog to shrink the page.
Centred and two-to-a-sheet files include crop marks where there is room outside the page. Where the edge of the paper is already the edge of the page, there is no mark; the page size stays the same.
The content margin moves the writing area away from the binding edge. It is space, not a hole position, and it cannot promise that a particular punch fits. Trim first, then line the page up with your punch’s own guide.
Print one test page first
Print one test page before the whole set. In the print dialog, choose the paper the PDF is made for, turn off Fit to page and any other scaling, and measure the test mark. The PDF is the right size; the printer settings decide whether it stays that way.
After trimming, measure the width and height before you punch. If they are off, fix the print size setting or the paper you chose; don’t guess a new page size to make up for it.
Binding and punch pattern
A4 specifies the paper dimensions. Choose the binding pattern for your actual binder or notebook.
The PDF leaves writing clearance. It does not print a hole template.